Which lipos for 9xl & 9920? Please help. 10c?15c?20c?

[Serum]

I would use a minimum of 4S or 5S with this motor, otherwise the motor will take very much current from your packs and run not as efficient as you would like.

Would these batteries be ok?

http://cgi.ebay.com/11-1V-4000Lithiu...QQcmdZViewItem

Originally Posted by 4u2nv

Would these batteries be ok?

http://cgi.ebay.com/11-1V-4000Lithiu...QQcmdZViewItem

OK, I'm going to clear up my question. I'm asking if I can use the batteries above with a 9920 esc and a 9xl motor. I will be using 2 - 11.1v 3s packs which should make 1 - 6s pack if I'm correct. So It should make a 11.1v 6s 4000mah 15c. Will this be good? What can I expect for speeds?

[MetalMan]

Originally Posted by 4u2nv

Would these batteries be ok?

http://cgi.ebay.com/11-1V-4000Lithiu...QQcmdZViewItem

NO!! If you look at the auction, it says this pack has 18ga. wire... That's WAY too thin. Even if the wire was thicker, I would not trust these "new Chinese cells"... Go for something with a reputation, like Hyperion, Polyquest, or LiMn.

20C is unnecessary IMO. If you get a pack that can handle about 45amps continuous with 80amps burst then that should be adequate. A 6000mah 8C pack is rated to deliver 48amps continuously (for example), and would give better runtime than a 4000mah pack. Unless you are extremely worried about weight, I wouldn't even get a 20C pack. You pay a lot extra for them, and 10C-15C packs are plenty...